Chapter 12. Working With Hosts

done, CloudPlatform recalculates or scales the used and reserved capacities based on the new over- provisioning ratios, to ensure that CloudPlatform is correctly tracking the amount of free capacity.

Note

It is safer not to deploy additional new VMs while the capacity recalculation is underway, in case the new values for available capacity are not high enough to accommodate the new VMs. Just wait for the new used/available values to become available, to be sure there is room for all the new VMs you want.

To change the over-provisioning ratios for an existing cluster:

1.Log in as administrator to the CloudPlatform UI.

2.In the left navigation bar, click Infrastructure.

3.Under Clusters, click View All.

4.Select the cluster you want to work with, and click the Edit button.

5.Fill in your desired over-provisioning multipliers in the fields CPU overcommit ratio and RAM overcommit ratio. The value which is intially shown in these fields is the default value inherited from the global configuration settings.

Note

In XenServer, due to a constraint of this hypervisor, you can not use an over-provisioning factor greater than 4.

12.9.4. Service Offering Limits and Over-Provisioning

Service offering limits (e.g. 1 GHz, 1 core) are strictly enforced for core count. For example, a guest with a service offering of one core will have only one core available to it regardless of other activity on the Host.

Service offering limits for gigahertz are enforced only in the presence of contention for CPU resources. For example, suppose that a guest was created with a service offering of 1 GHz on a Host that has

2 GHz cores, and that guest is the only guest running on the Host. The guest will have the full 2 GHz available to it. When multiple guests are attempting to use the CPU a weighting factor is used to schedule CPU resources. The weight is based on the clock speed in the service offering. Guests receive a CPU allocation that is proportionate to the GHz in the service offering. For example, a guest created from a 2 GHz service offering will receive twice the CPU allocation as a guest created from a 1 GHz service offering. CloudPlatform does not perform memory over-provisioning.

12.10. VLAN Provisioning

CloudPlatform automatically creates and destroys interfaces bridged to VLANs on the hosts. In general the administrator does not need to manage this process.

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Citrix Systems 4.2 manual Vlan Provisioning, Service Offering Limits and Over-Provisioning
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4.2 specifications

Citrix Systems, a leading provider of virtualization solutions and cloud computing technologies, released version 4.2 of its popular software, Citrix XenApp, which was previously known as Presentation Server. This version marked a significant evolution in providing users with remote access to applications and desktops, emphasizing simplicity, performance, and security.

One of the standout features of Citrix XenApp 4.2 is its improved application streaming capabilities. This technology allows applications to be delivered to users in real-time, reducing the need for extensive local installations and enhancing the user experience. With application streaming, administrators can efficiently manage applications on a central server while ensuring that users have immediate access to the necessary tools.

Another highlight of this version is the enhanced security measures put in place to protect sensitive data. Citrix XenApp 4.2 includes support for SSL encryption, providing a secure communication channel for data transmitted between the server and clients. This is particularly crucial for businesses that need to comply with strict data protection regulations. Additionally, the integration of endpoint security features ensures that unauthorized access to applications is minimized.

Performance enhancements are also a critical focus in this release. Citrix optimized the delivery of applications over various network conditions, ensuring that users experience minimal latency regardless of their location. This was achieved through the incorporation of SmartAccess and SmartControl technologies, which allow administrators to set policies based on user roles, device types, and network conditions. This level of granularity enables organization-wide security without compromising on usability.

The user experience was further improved with a revamped interface, making it easier for end-users to access their applications and data. Simplified menus, clear navigation paths, and the ability to customize user settings contributed to a more efficient workflow, allowing users to focus on their tasks rather than struggling with the software.

Finally, Citrix XenApp 4.2 was designed to be highly scalable. Organizations of all sizes could deploy this solution to deliver applications efficiently, adapting to their specific needs as their user base grows or changes. This flexibility is crucial for businesses looking to future-proof their IT investments while maintaining optimal performance.

In summary, Citrix XenApp 4.2 stands out with its enhanced application streaming, robust security features, improved performance under varying conditions, user-friendly interface, and scalability, making it an ideal choice for organizations seeking to leverage virtualization for remote access to applications and desktops.
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